Lathe-dog



C. G. CASHMAN.

LATHE DOG.

APPLICATION FILED NOV.17, 1919.

1,368,485; Patented Eeb. 15,1921.

Clt/rom my UNITED ,j s'rxrnsN PATENT Y ermee.

CLARENCE Gr. CASHMAN, 0F WAYNESBORO, PENNSYLVANIA, ASSIGNOR OF ONE-HALF T0 JOHN IB. EADER, 0F VWHYNIESBORO, PENNSYLVANIA.

LATHE-DO'G.

Specification of Letters Patent.

YPatented Feb. 15, 1921.

Application filed November 17, 1919. Serial No. 338,647.

To all whom 'it 'may concern Be it known that I, CLARENCE Gr. :CASH- MAN, a citizen of the United States, residing at Vtaynesboro, inthe county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Lathe-Dogs, of which the following is a Specification.

'Ihis invention relates to lathe dogs, and has for an object to provide a dog which is secured in and carried by the tool-holder of an ordinary lathe, and adapted to hold a drill, bit, or other boring implement, against rotation while the work is being rotated by the head, and to compensate for movements of the drill and also the vertical position of the drill relative to the tool-holder.

With these and other objects iny View, the invention comprises certain novel combinations and arrangements of parts as will be hereinafter more fully described and claimed. Y

In the drawings,

Figure 1 is a top plan view of a conventional lathe with a dog applied thereto holding a boring implement.

F ig. 2 is a perspective view of one type of the dog.

F ig. 3 is a view of a dog in edge elevation.

Fig. 4 is a longitudinal, sectional view of the improved dog.

F ig. 5 is a sectional view of a modified form of a dog.

Fig. 6 is a perspective view of the type of dog shown at Fig. 5.

Like characters of reference indicate corresponding parts throughout the several views.

The improved dog, which forms the subject-matter of this application, is adapted to be used in association with machine lathes of various types conventionallyT shown at Fig. 1, having a head 10, tail stock 11, and toolholder 12. To the head 10 the work 13 is clamped in any usual well-known manner, and the drill or boring implement 14 applied thereto with the tail stock moved up into engagement with the rear end of the drill to receive the point 15.

As ordinarily practised, a dog is clamped on the drill 14, and is held manually by the operator to prevent rotation of the drill while the work is rotated. According to the present invention, the dog comprises a sleeve 16fof substantially the usual and ordinaryl formation, having a set-screw 17 for securingV the dog upon the drill.l The sleeve 16 has a linger 18 oiiaset therefrom, provided at its extremity with a ball 19. A bar 20 is provided of proper proportions to be lclamped into and by the tool-holder 12 of the lathe, and is provided at one end with a socket 21, receiving the ball 19, forming L a ball and socket or universal joint, a pin 22 being employed to prevent displacement of the ball 19 from the socket 21.

As a modification, instead of the point 15 engaging directly against the drill, a chuck l 23 is provided, having a socket 24 proper4 tioned to receive a drill of substantially the usual and'ordinarytype, and with a recess similar to the recess described as formed in the drill 14 to receive the point 15.

Instead of employing such chuck 23 and the dog 16, the finger `18 is formed directly upon the body of the chuck, and the ball 19 formed directly upon the finger 18. By this arrangement the bar 20 is attached directly to the ball 19, serving the same purpose of maintaining the drill against rotation accomplished by the dog 16.

With either embodiment of the invention, the universal joint formed between the drillretaininof member and the bar 20 provides for a dierence in altitude of the drill relative to the tool-holder; also provides for variations produced by movements of the tool-holder or the tail stock, or both, in the ordinary use of the device. As ordinarily practised, the manual holding of the lathe dog results-in moving the drill from correct alinement, whereby many drills are broken, which is obviatedr by the use of the device disclosed in this application.

In operation it is obvious that the dog 16, when employed, will be placed upon the drill before the drill is positioned to its work, and after having been properly clamped against the work by the movement of the tail stock, the necessary adjustment with the toolholder is accomplished. With the use of the embodiment shown at 23, a similar adjustment of the drill is accomplished with the final adjustment of the holding mechanism with and by the use of the tool-holder.

What I claim is:

1. A lathe dog comprising a tool-holding sleeve, a bar proportioned for engagement by the tool-holder of the lathe, and a universal joint formed between the tool-holding Vio Vball from the socket.

mechanism and the bar.

2. The combination with a lathe embodying a tool-holder, of a lathe dog embodying ,a drill-receiving and retaining member, a bar proportioned to be positioned by theV tool-holder, and a ball and socket joint formed between the drill-receivingv member and the bar.

3. The combination with a lathe embodying a tool-holder, of a member provided with a drill-receivingand retaining recess, an arm formed upon thedrill-receiving member, a bar proportioned to be secured to 4the tool-holder, and a universal joint formed 5. The combination With a lathe embodying a tool-holder, of a lathe dog provided With a drill-receiving recess, meanstopre` vent rotation of the drill Within the recess, an arm 'formed upon, the drill-receiving member, a ball Vormedrat the extremity of the arm, a bar proportioned to be inserted and secured in the tool-holder and provided with a socket proportioned to receive the ball, and means to prevent displacement of the ball from the socket y 6. A lathe dog comprising a drill-receiving sleeve, means to prevent rotation of the drill within the sleeve, a bar, andA a ball and socket joint connecting the barivith the sleeve. Y j Y 7. A lathe dog comprising adrill-receiving` sleeve, means to prevent rotation of the drill `Within the sleeve, an arm formed upon the lsleeve and provided at its extremity With a ball, a bar provided With a socket proportioned to receive the ball, and means to prevent displacement of the .ball from the socket.

8. The combination with a lathe, yof a drill-receivingsleeve, means to prevent rctation of the drill Within the sleeve, means to apply feeding stress tothe sleeve, a toolholder-engaging bar, and a ball and socket joint formed between the sleeve and the bar. f f

In Witness whereof, I have hereunto -set my hand and seal at. Waynesboro, B61111534 Vania, this twenty-eighth day of October, A. D. nineteen hundred and nineteen.

l CLARENCE Gr. CASHMAN. [n.sl Witnesses: y W

H. E. CRAIG,- ALF. N. RUSSELL. 

